Group C was a racing category introduced by FIA in 1982. It ran until 1993. Group C cars were used in various series such as FIA's World Endurance Championship.
The category was designed to replace Group 5 and Group 6. Its regulations were an answer to ever increasing boost pressures. Amount of refuels and a limited fuel tank size meant that you could only go so far with engine power alone. This put pressure on developing other aspects of race cars in the category.
Group C prototypes are aerodynamic and reach very high speeds with high downforce.